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岩土的导热系数对工程施工和工程运行有较大影响,研究不同含水率条件下的导热系数变化规律对岩土的导热理论和工程实践具有重要意义。根据《土工试验规程》制备出粗砂、中砂、细砂、粉砂和粘土等5种工程常用土,试验分析了不同含水率时的导热系数变化规律,并根据试验结果得到5种土导热系数随含水率变化的拟合公式。结果表明,5种土的导热系数均随含水率的增加呈非线性增加。含水率在0~15%时,导热系数由大到小顺序依次为粗砂、中砂、细砂、粉砂和粘土;含水率超出20%时,中砂、细砂、粉砂的导热系数变化趋于平缓并呈轻微下降趋势;含水率大于25%时,粘土导热系数呈下降趋势。
The thermal conductivity of rock and soil has a great influence on the construction and engineering operation. It is of great significance to study the variation of thermal conductivity under different water content conditions for the thermal conductivity theory and engineering practice of rock and soil. According to the “Geotechnical Test Regulation”, five kinds of engineering common soils, coarse sand, fine sand, silt and clay, were prepared. The variation of thermal conductivity at different moisture contents were tested. According to the test results, Fitting formula of coefficient changing with water content. The results show that the thermal conductivity of all five kinds of soil increases nonlinearly with the increase of water content. When the moisture content is 0-15%, the thermal conductivity coefficients are coarse sand, middle sand, fine sand, silt and clay in ascending order of the thermal conductivity. When the moisture content exceeds 20%, the thermal conductivity of middle sand, fine sand and silt The change tends to be gentle and shows a slight downward trend; when the moisture content is more than 25%, the clay thermal conductivity shows a downward trend.